How to load unsigned drivers on the windows pre installation environment

[zvqle .]

I'm trying to load a specific unsigned driver on a windows preinstalltion environment (through opening up boot.wim, taking out the system key, adding a service on boot, and putting it back in) and I also enabled test signing and disabled integrity checks (by finding bcd-template and adding the values there). But I still get the recovery screen on boot saying it couldn't verify the digital signature of said driver Is there any other way or did I mess up something?

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